Grating.



UNITED strA'rEs PATENT OFFICE.

JACOB MARK, OF BROOKLYN, AND EMANUEL N. MOHL, OF NEW YORK, N. Y.,ASSIGNORS TO THE FIRM OF .MARK & MOHL, INC., OF BROOKLYN, NEW YORK.

GRATING.

Specification of Letters Patent.

Patented May 25, 1915.

Application filed July 6, 1914. Serial No. 849,324.

, ing at 205 Henry street New York, in the county and State of New York,have invented a'new and useful Grating, of which the following is aspecification.

, Our invention relates to improvements in gratings used for areaways,sidewalk openings, subway coverings, fire-escape treads and platforms,stair treads and platforms, guards for windows or openings in walls,

openings in interiors of structures and for similar purposes; itconsists in the novel features hereinafter more fully described.

The objects of our improvement are: First to produce a grating of greatstrength and durability with a minimum expense of material and labor;second, to produce a grating of attractive appearance; third, to producea grating, which is comparatively free from dirt and obstructionsaccumulat-- plan of our grating all finished, and Fig.

4 is an end view of the grating partly finished as in Fig. 2. Fig. 5 isan elevation of the detail 21, which is a modified form of the detail11. Fig. 6 isan elevation of a modified form of our grating, and Fig.7is a plan of the same. Fig. 8 is a plan of the detail 21 shown in Fig. 5in elevation.

Similar numerals and letters refer tosimilar parts throughout theseveral views.

Our grating, as shown in Figs. 1, 2, 3 and 4, consists essentially oftwo sets of bars: 1. Longitudinal bars 12, having curved slots punchedin them. 2. Transversebars 11, having notches 13 and 13 punched or cuton their curved edges; the

said transverse bars 11 have the same formin cross-section as the slotsin the longitudinal bars 12; the notches 13 and 13 are about equal inwidth to the thickness of the longitudinal bars 12. The strips 14 of thebars 11, which are contained between the notches 13 and 13, are equal inlength to the distance between the longitudinal bars 12. 15 and 15* arethe necks which are left in the bars 11 under the strips 13 and 13. Ourgrating is formed by passing the trans; verse bars 11 through the slotsin the longitudinal bars 12, as shown at the right of- Fig. 2 insection, until the notches 13 and e13 of the bars 11 will coincide withthe thickness of the bars 12; the strips 14 are then unbent until theybecome vertical and straight, their vertical edges thereby becominghorizontal and flush with the surface of the grating, as shown at theleft of Fig. 2 in dotting. The necks 15 and 15 will remain in the slotsof the bars 12, and they will prevent the bars ,11 from being eitherraised or lowered.

Figs. 5, 6, 7 and 8 show a modification of our grating, in which thetransverse bars 21 have their lower edges curved, instead of the upperones as in Figs. 1, 2, 3 and 4. Instead of notches, the bars 21 havetongues 23 and 23 which are formed by slitting the curved edges of thebars 21. 24 are the strips contained between the tongues 23 and 23*. Thelongitudinal bars 22 have their slots extending to the surface of thegrating; the outline of these slots is identical with the end view ofthe transverse bars 21.

To assemble our grating, the transverse bars 21 are inserted into theslots of-the longitudinal bars 22, the tongues 23 and 23" coinciding inthickness with the depth of said slots .and filling them up; the curvedstrips 24 of the bars 21 are then unbent downwardly to a verticalposition, as shown in dotting in Fig. 6.

A driving fit may be given the slots and notches of our grating ineither modification of it to secure rigidity of the same.

In the form of our grating shown in Figs. 1, 2, 3 and 4, tongues mayalso be used instead of the notches 13 and 13*; but the tongues 23 and23 cannot be omitted from the modification shown in Figs. 5, 6, 7 and 8.

Many other modifications could be made in the form and details of ourgrating with- .out departing from the main scope of our invention. We donot, therefore, restrict ourselves to the form of our grating asdisclosed by the drawings; but we intend to include also all reasonablyobvious modifications and'all mechanical equivalents of the same.

"What we claim as our invention and desire to secure by Letters ?atentis i. A. grating comprising longitudinal bars and transversebars saidlongitudinal bars having slots adapted to fit the initial shape of saidtransverse bars, the upper ends of said slots extending in a direction,which is at an angle to the lower ends of said slots, said transversebars passing through said slots, and said transverse bars having slitson their edges flush with the surface of said longitudinal bars, thestrips of said transverse bars inclosed between said slits being I theline of said slots.

having slots adapted to 3. A grating comprisinglongitudinal bars andtransverse bars, said longitudinal bars of said transverse bars, saidslots, being in a vertical plane when grating is horizontal,

said

fit the initial shape the lower ends of g and the upper ends of a aintense said slots being at an angle to said lower ends said transversebars passing through said 510a, and said transverse bars having slits ontheir edges flush with the surface of said longitudinal bars; the stripsof said 4 transverse bars inclosed between said slits being bent out ofthe line of said slots into a vertical plane when said grating ishorizontal.

4. A grating comprising longitudinal bars and transverse bars, saidlongitudinal bars having curved slots, and said transverse bars passingthrough said slots and having tongues anchored therein, and the portionsof said transverse bars inclosed between said "longitudinal bars beingvertical! when said grating is horizontal.

5. A grating comprisinglongitudinal bars and transverse bars, saidlongitudinalbars having curved slots, and said transverse bars passingthrough said slots and having on. their upper edges tongues anchored insaid slots, the portions of said transverse closed between saidlongitudinal bars being vertical when said gratingi's horizontal.

JACOB MARK. EMANUEL N. MOHL. Witnesses:

W. J. MQCAFFREY, J. W. Frames.

bars ina

